Rust

Make easier to create custom schedulers and executors (#1118) #2705

Job	Run time
Build Libraries on AMD64 Rust stable	14m 12s
Test on windows-latest Rust stable	8m 26s
Test on macos-latest Rust stable	3m 25s
Lint	24s
Docker	18s
Test Workspace on AMD64 Rust stable	9m 21s
verify benchmark results (amd64) (amd64, stable)	10m 54s
Test Ballista on AMD64 Rust stable	5m 42s
Check Cargo.toml formatting (amd64, stable)	1m 45s
Clippy (amd64, stable)	3m 20s
	57m 47s

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